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An ethylene propylene rubber polyampholyte (EPR‐g‐PA) containing zwitterionic ammonium carboxylate grafts is prepared by reacting maleated EPR (EPR‐g‐MAn) with a tertiary amino alcohol, 2‐[2‐(dimethylamino)ethoxy]ethanol (DMAEE). EPR‐g‐PA has equivalent viscoelastic properties to an EPR that is lightly cross‐linked using a peroxide cure, but with a higher strain hardening coefficient and elongation at break. EPR‐g‐PA has similar adhesion to metals and improved adhesion to other ionomers, whereas the adhesive strength to a polyamide substrate is reduced compared to the EPR‐g‐MAn. The in situ reaction of EPR‐g‐MAn with DMAEE during blending with PP produced a blend with superior impact properties compared to the thermoplastic vulcanizate (TPV) blend of peroxide cross‐linked EPR‐g‐MAn and PP.
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Powell et al. (2013) studied this question.
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